--7. Define a function that joins a list of lists together using a separator value:
---- file: ch03/Intersperse.hs
--intersperse :: a -> [[a]] -> [a]

intersperse :: a -> [[a]] -> [a]
intersperse sep (list:listOfLists) = list ++ [sep] ++ intersperse sep listOfLists
intersperse sep [] = []
